I have not, but I have friends who did here in Germany. If you are okay living in the middle of nowhere (that includes no, or laughable public transport), you can get one for 500k€. If you also have relevant skills (and friends/family with those as well), you can buy one that needs renovation for half of that.
My experience is in Northern Germany, I heard of even lower prices in the east.
I see plenty of decent looking houses in towns and city outskirts, far from the middle of nowhere, for less than 300K in NRW. What are you buying, a mansion? Or do you want it within 30 minutes walking/cycling distance of the city center? I mean, come on.
My experience is in Northern Germany, I heard of even lower prices in the east.